Buchi Syncore, Operation Manual

Page: 28 / 46

Syncore
Platform
28
5 Operation
5.12 Adjusting the eccentricity
Introduction
The unit allows an adjustment of the eccentricity of the
horizon tal shaking movement between 0 and 5 mm.
Please note that the moving parts take up more energy when
the eccentricity is greater and the rotational speeds must be
reduced accordingly.
If the unit itself or the area around it should begin to vibrate
strongly when the shaking movement is started, shut off or
reduce the shaking movement imme dia telyand adjust the
settings.
Select an eccentricity for the vortex movement such that a
sample becomes thoroughly mixed, i.e., is brought into a
swirling movement, at a minimum shaking speed,
For example, a sample in a R-6 glass (in Rack R-6) is set
into a swirling movement very efficiently at 250 RPM with
an eccentricity of 4.0 mm. With an eccentricity of 2.5 mm,
significantly higher speeds of approx. 400 RPM are needed
for the same sample.
In addition to this, the swirling movement of the liquid in the
glass is less effective. With an eccentricity of only 1 mm, the
sample no longer moves sufficiently.
We recommend the following adjustments of eccentricity:
Rack Eccentricity
R-4 4 - 5 mm
R-6 4 - 5 mm
R-12 4 - 5 mm
R-24 2.5 - 4.5 mm
R-96 2 - 4 mm
Optimum eccentricities
Defined stopping position of the unit
The Syncore single platform has a built-in sensor that de-
termines the position of the base plate at the given moment
relative to a fixed point. To activate this function change the
Dip Switch position 5 to the top position (see p. 25).
When the horizontal vortex movement of the base plate is
ended, this sensor is used to keep the base plate moving
in a final rotation until it has reached a pre-defined stopping
position. This means that the rack and/or a given sample in
the rack are always in the same position before and after a
vortex movement. This, for example, makes it possible to
integrate the unit into a robot station. The prede fi ned stop-